Apparatus for cleaning boiler tubes



Jgl'y 17, 1928. 1,677,836

' J. P. MARTINUSSEN APPARATUS FOR CLEANING BOILER TUBES Filed April 21, 1925 [we/1Z0 J 1? Han iizzuss e12.

I y W Patented July .17, 1928.

"UETE STATES JOHANNES PETER MARTINUSSEN, OF COPENHAGEN, DENMARK.

APPARATUS FOR CLEANING BOILER TUBES.

Application filed April 21, 1925, Serial N0. 24,886, and. in Denmark April 25, 1924.

The present invention relates to an apparatus for removing soot and rust, as well as scale and other deposits from boiler tubes, both in water tube and in fire tube boilers.

It has, in practice been found to be inconvenient to have one single tool only for cleaning boiler tubes, with which the entire cleaning had to be performed, as the same tool with which the coarse deposits are first removed, cannot be very well also used for the last cleaning when there is the question of removing the remainders after the picking proper, as the continuous picking at the same spot may entail the danger of injuring the tubes.

In order to avoid this danger it will be more practical to first employ a hammer-tool or -pick which will first loosen the worst deposits, whereupon another tool is employed which will remove the remaining parts in any convenient manner.

An apparatus for performing the loosening of the deposit is shown in the drawing in which Fig. 1 shows a hammer-tool or -pick for picking the coarse deposits, in front elevation, with its casing in section.

Fig. 2 is a side elevation of the same tool.

In Fig. 1, the numeral 2 indicates a casing having a bearing for a shaft 1, which.

bears within the casing an eccentric disc 3 with a pin 4, adjustable in a slot 5, so that the diameter of the circle in which the pin rotates may be adjusted according to the spacing of the rows of boiler tubes. To provide for such adjustment the disc 8 has a row of holes 22. Through one of these holes a screw 23 holds the foot 24 of the pin 4 in the slot 5.

The pin 4 cooperates with the head 6 of a connecting rod 7, in which head the pin 4 is journalled in a roller or ball bearing. The said connecting rod is, by means of a crosshead coupled to a rod or stem 8, the lower end of which is coupled to a hammer-head 9, this head having the shape of a cross and thereby adapted to clean simultaneously four quarters of four separate tubes.

Owing to the violent blows by the hammer-head it would be difficult to manipulate the apparatus. lVith the object, therefore, of obviating this difliculty, an elastic support is provided which consists of a bar 11 intended to be placed on a row of tubes, and which is connected to the casing by means of guide studs 12 and coiled springs 13.

l/Vhen the hammer tool is to be used, a hammer-head 9 is first fitted to it, the stem 8 of which head corresponds to the distance down to the tubes which are to be cleaned. Then the length of stroke is set according to the distance between the tubes by adjusting the eccentricity of the pin 4. Now the hammer-head is passed down between the 1 tubes, until the bar 11 rests on the uppermost tubes, whereupon the motor is started and the hammer tool and machine is moved along on the tubes, whereby the scale and the like is picked off.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: I

1. A tool for cleaning boiler tubes arranged so that each group of four are spaced at the corners of a rectangle, comprising a 75. hammerhead of substantially cross shape having four surfaces of quadrant curvature adapted to engage the surfaces of four tubes to simultaneously clean one quarter of each, means to reciprocate said head between said tubes, a casing carrying said reciprocating means, and an elastic support for said casing comprising a bar-adapted to be spaced on a row of tubes and connected to the casing by means of guide studs and coil springs.

2. A tool for cleaning boiler tubes arranged so that each group of four are spaced at the corners of a rectangle, comprising a hammer head of substantially cross shape having four surfaces of quadrant curvature adapted to engage the surfaces of four tubes to simultaneously clean one quarter of each, a drive shaft, a disc thereon, a pin adjustably positioned on one face of said disc and a connecting rod joining said pin and head so that the movement of said head may be adjusted in accordance with the pitch of said tubes.

3. A tool for cleaning boiler tubes arranged so that each group of four are spaced at the corners of a rectangle, comprising a hammer head of substantially cross shape having four surfaces of quadrant curvature adapted to engage the surfaces of four tubes 6 to simultaneously clean one quarter of each, a carrying rod for said head, a drive shaft, a disc thereon, a pin adjustably positioned on one face of said disc, a connecting rod joining said pin and carrying rod, a casmg carrying said shaft and disc and guiding 10 said carrying rod and a resilient support adapted to guide said casing over said tubes. In testimony whereof I afiix my signature.

JOHANNES PETER MARTlNUSSEN. 

